See Yellowstone National Park’s most colorful hot springs from a great vantage point when you hike the Grand Prismatic Spring Overlook Trail. This easy trail takes hikers across the Firehole River ...

Yellowstone Caldera Chronicles is a weekly column written by scientists and collaborators of the Yellowstone Volcano Observatory. This week’s contribution is from Michael Poland, geophysicist with the ...

The Grand Prismatic hot spring in Yellowstone National Park is sourced from a magma chamber beneath it. The bright colours are produced by hydrophilic bacteria in the mineral-rich water. Disclaimer: ...